The input waveform is fixed to a duration of 4 seconds (\(16000 \times 4\)  samples) either by concatenation or truncation of source audio data. Feature extraction is performed using a set of \(C\)  sinc filters [1]}. Each filter performs time-domain convolution upon the input waveform. The impulse response of each filter is defined according to:
\(g[n,f_{1}, f_{2}]=2f_{2}sinc(2\pi f_{2}n)-2f_{1}sinc(2\pi f_{1}n)\) 
